/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.flume.node;

import java.io.File;
import java.util.List;

import junit.framework.Assert;

import org.apache.commons.io.FileUtils;
import org.apache.flume.lifecycle.LifecycleController;
import org.apache.flume.lifecycle.LifecycleState;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;

import com.google.common.collect.Lists;
import com.google.common.eventbus.EventBus;
import com.google.common.eventbus.Subscribe;
import com.google.common.io.Files;

public class TestPollingPropertiesFileConfigurationProvider  {

  private static final File TESTFILE = new File(
      TestPollingPropertiesFileConfigurationProvider.class.getClassLoader()
          .getResource("flume-conf.properties").getFile());

  private UriConfigurationProvider provider;
  private File baseDir;
  private File configFile;
  private EventBus eventBus;

  @Before
  public void setUp() throws Exception {

    baseDir = Files.createTempDir();

    configFile = new File(baseDir, TESTFILE.getName());
    Files.copy(TESTFILE, configFile);

    eventBus = new EventBus("test");
    ConfigurationSource source = new FileConfigurationSource(configFile.toURI());
    provider = new UriConfigurationProvider("host1", Lists.newArrayList(source), null,
        eventBus, 1);
    provider.start();
    LifecycleController.waitForOneOf(provider, LifecycleState.START_OR_ERROR);
  }

  @After
  public void tearDown() throws Exception {
    FileUtils.deleteDirectory(baseDir);
    provider.stop();
  }

  @Test
  public void testPolling() throws Exception {

    // let first event fire
    Thread.sleep(2000L);

    final List<MaterializedConfiguration> events = Lists.newArrayList();

    Object eventHandler = new Object() {
      @Subscribe
      public synchronized void handleConfigurationEvent(MaterializedConfiguration event) {
        events.add(event);
      }
    };
    eventBus.register(eventHandler);
    configFile.setLastModified(System.currentTimeMillis());

    // now wait for second event to fire
    Thread.sleep(2000L);

    Assert.assertEquals(String.valueOf(events), 1, events.size());

    MaterializedConfiguration materializedConfiguration = events.remove(0);

    Assert.assertEquals(1, materializedConfiguration.getSourceRunners().size());
    Assert.assertEquals(1, materializedConfiguration.getSinkRunners().size());
    Assert.assertEquals(1, materializedConfiguration.getChannels().size());


  }
}
